Update scaling_strategies.md

A small typo fix.
Merge pull request #155 from quulah/patch-1

Fix the name of the project
[contacts] SE contact routing doc improvements, multi-contact
[contacts] multi-contact, configured -> configure
[contacts] fixed email contact example json
Merge pull request #157 from portertech/feature/contacts

Sensu Enterprise contact routing doc improvements, multi-contact support